Boiler



Nov. 4, 1930. J. v-AN BRUNT 1,780,285

BoILR Filed May 24, 192e z' sheets-sheet 1 Wmw A TTORNE Y6' Nov. 4, 1930. J; VAN B'RUNT 1,780,285

BOILER Filed May 24 1926 2' Sheets-Sheet 2 l ll Q fJ-Ljuuil :www [I l I i lla-JI 1N vENTR ATTORNEYS Patented Nov. 4, 1930 UNITED STATES PATENT OFFICE JOHN VAN IBRUNT, OF FLUSHING, NEW YORK, ASSIGNOR TO INTERNATIONAL COM.'-

BUSTION ENGINEERING CORPORATION, DELAWARE oF NEW YORK, N. Y., A CORPORATION E BOILER Application led May 24,

in the form of powdered coal.

One of the primary objects of the invention is novel disposition of superheater elements.

Another' and more specific object of the invention is to provide a Wall marginal of the combustion space, in part formed by boiler ings, whereintubes, and in part by superheater tubes.

More generally my invention is intended to secure effective superheating, particularly in furnace-shaped boilers.

The foregoing, together with such other objects as may hereinafter appear, or are incidentto my invention, are obtained by means of a construction Which I have illustrated in preferred form in the accompanying draw- Fig. 1 is a vertical section through a furnace-shaped boiler embodying my improvements.

Fig. 2 is a sectional view illustrating certain details of my invention.

Fig. 3 is a vertical section through'a modified form of my invention.

Fig. 4 is a sectional view taken on the line 4--4 of Fig. 3 illustrating a portion of the roof wall employed in the modification shown therein.

Fig. 5 is a fragmentary sectional view illustrating still another modification of the invcnti'on.

Referring now to Fig. l, the reference character A denotes the furnace-shaped boiler considered as a whole. This boiler comprises a main upper drum 7 and a main lower drum 8 connected by abank of tubes 9 constituting an economizer and downcomer section of the boiler; the small upper header or drum 10 and the lower drum 11, such drums 'being conf nected by a row of longitudinally finned upright tubes 12 constituting the front Wall of the combustion space defined by the boiler; the rear water wall consisting of a'row of longitudinally finned tubes 13, the lower'ends of which are connectedinto the drum 8, and the upper ends of which are connected into the header 14; the roof Wall composed of longi- 1926. Serial N0. 111,138.

tudinally finned tubes 15 connected at their lower ends into the header 14 and at their upper ends into the header 10; the side walls each composed of a row of upright tubes 16, the lower ends of'which are connected to the header 17, in turn connected to the drum 8, and the upper ends of which are connected into the header 18, in turn connected to the header'lO, it being understood that there is a header 17 and a header 18 for each side wall; and the bank of tubes 19 connecting the drums 8 and 11, together with the equalizer tubes 2O connecting the header 10 with the drum 7.

Powdered coal is preferably admitted at the four corners of the combustion chamber defined by the boiler above described through burners 21, preheated -air being admitted at thel burners in a manner to be hereinafter described. By admitting the powdered coal at the corners in this manner, violent and turbulent combustion is set up, the fuel being consumed with a relatively short flame which has intense temperature. The furnace-shaped boiler being of the down-draft. type, the gaseous products ofY combustion are drawn through the bank of tubes 19 into the settling chamber 22, from which the gas is passed to the off'take 23, within which is located the bank of tubes 9. This bank of tubes is batiled, as at 24, so that the gases take the path indicated by the arrows to the stack'25.

The bank of tubes 9 is spaced away from the rear wall 13 of the boiler, so as to provide a space for the convection superheater elements or tubes 26, over whichthe gases of combustion are passed by reason of the presence of the baffle 24.

The tubes 16 composing the side walls of the boiler have fins 27 extending partway from each end, thereby` providing spaces between the tubes where the tubes are not finned. Located within these spaces and between the tubesl are radiant sul'ierheater tubes 28, the lower ends of which are connected into a header 29, and the upper ends of which are connected into a header 30, it being understood that both side walls are the same in this respect. The headers 30 are connected to one end of the superheater elements 26 the other end of' the superheater elements being connected to the steam drum 7 The headers 29 are connected to the steam main by means of the pipes 29a.

The superheater tubes 28 are thus radiant superheater elements, and they cooperate with the tubes of the side walls of the combustion chamber to constitute an evaporating wall.

It will, of course, be understood that the furnace-shaped boiler is provided with a suitable sheathing 31.

An air heater 32 is located in the stack 25, and preheated air is led therefrom to the burners by the casing 33.

In the arrangement of Fig. 3, the tubes 16El constituting the side walls of the boiler furnace are longitudinally finned throughout their length, and the root` wa'll tubes l5a are nned for only a -portion of their length at each end, and superheater elements or tubes 28a are disposed between the rootl tubes and extendinglongitudinally thereof in the spaces therebetweensothat the twocooperate to form an evaporating Wall for the roof subject to radiant heat. In the construction of this figure, it is also to be noted that the convectionsuperheater tubes 26 are connected, as before, 1n series with the superheater tubes Q8, and in other respects, the arrangement is substantially the same as that shown in Fig. 1.

In themodification shown in Fig, 5, substantially the same arrangement as that employed in Fig. 3 is followed, with the exception that the convection superheater elements and the radiant' superheaterelements are connected in parallel.

I claim:

In combination, a furnace shaped tubular boiler, the tubes of which have abutting fins throughout a portion of their length and a superheater, the tubes of which are located in the spaces between unfinned portions of the boiler tubes, said superheater tubes and boiler tubes bein in substantial juxtaposition, the fins, boller tubes and superheater tubes cooperating to form a substantially continuous wall marginal of the combustion space.

In testimony whereof I have hereunto signed by name.

JOHN VAN BRUN T. 

